Dampers In HVAC

What Are The Common Types Of Dampers In HVAC

There are two unique uses for dampers at the top standard: HVAC (heating, ventilation, and air conditioning) and commercial process applications. While there is some natural crossover, the page concentrates solely on damper varieties for commercial operations.

Dampers, which you may find within ducting, between apartments, or even between the exterior and inside of a building, use movable blades to control circulation from one end of the damper to another.

Shock absorbers are more than just airflow regulators. They play a crucial role in regulating cold, warm, hot, unclean, or even poisonous air. You can use them to keep your home safe from fire. Dampers are necessary for circulation control because they preserve air quality and promote safety regulations. Air duct sanitizing Roswell GA on time can help the HVAC system work properly.

Furthermore, the range of design options for dampers gives them the greatest alternative for large and intricate structures; it gives you the freedom to choose the dampers most suitable for your central business controller. However, deciding on the best solution might be difficult, leaving you wondering: which of the various dampers is best for you?

Each performs a distinct role, and choosing the proper design is critical for long-term, reliable operation. We’ll walk you through the many forms of commercial dampers and their uses in this article to assist you in making a choice.

1. Dampers With Multi-Blade Option

Rectangular dampers and multi-blade vented dampers are common names for multi-blade controllable dampers. The blade’s action – the orientation in which the blades revolve in the controlling absorber – distinguishes these adjusters into two types. All blades open and shut around the same angle and in the same plane, known as parallel blade movement.

A similar rotor spins in different directions instead of blade movement.

For transparent operation, identical blade absorbers are utilized, while opposing blade dampers are employed for modifying damper action. However, close to the end of the operational range, similar blades provide greater circulation control. Airflow is better controlled with opposing blades across the whole operating range. You can get dryer vent installation and repair Roswell for your vent system.

When it makes sense, professionals utilize concurrent blades to drive or push air to one side, whereas opposing blades offer more laminar circulation.


Temperatures of over 1800°F and forces of over 60 in. wg, multi-blade control dampers can handle them. As a result, they’re suitable for a wide range of manufacturing uses and facilities.

Gas turbine nozzles and outputs, fan vents, atmospheric emissions, scrubbers/oxidizers, and chemical precipitation can benefit from parallel blade dampers.

For quick energy production, air purifier inlets, blower discharge outlets, and glassware or metal heating systems, opposing blade absorbers are ideal.


Flapper valve dampers and hole filters are terms that people use to describe face and bypass absorbers. High-temperature gasses from turbines are typically sent to heat recovery using this sort of damper. These relievers are usually seen in a tee-pipe layout as a component of a twin damper setup.


Many specialists commonly use face and bypass dampers in waste heat recovery boilers in cogeneration plants. You can also utilize them for pollution management, gas power exhausts, and heat recovery systems.

3. Dampers With A Single Blade

Butterfly dampers and wafer dampers are terms that people use to describe single-blade dampers. These absorbers are available in square, round, and rectangular shapes. Only one or double-thickness airfoil rotors are available. A single-blade absorber is often more cost-effective than a costly valve.


You can use butterfly dampers for several purposes. Although many people typically utilize them for stream performance and low leaking or isolation. Such valves can also tolerate high design temperature and pressure while maintaining modest pressure loss throughout the network. Single blade absorbers are excellent for environmental standards and sewage treatment purposes. Because you can utilize them in the networks with corrosive and gritty air flows.

4. Pressure Relief & Backdraft Dampers

Backdraft absorbers, also called gravity dampers, are utilized in various industrial and commercial applications, including light, moderate, and heavy-duty industries and HVAC applications.

Backdraft dampers enable autonomous air circulation in only a single channel while avoiding backflow. Fans often have backdraft absorbers to reduce rebound damping, causing the fan to backspin.

These functionalities are also possible with pressure relief dampers, which start to open force at a higher, and in most instances, configurable. People often use these dampers to keep the system from over-pressurizing.


Steel companies, utility factories, and refineries may be using both backdraft and pressure relief damping because these facilities demand a lot of outflows and pressure venting and evacuation.

5. Dampers For Inlet Vane

Inlet vane dampers are also variable inlet vanes or inlet vane controls (IVC dampers). Specialists utilize these dampers on a blower’s or a fan’s input side to manage the stream relation. Professionals usually install them directly at the fan’s intake. They can provide simultaneous fan adjustment and shut-off by revolving in a precise position to pre-spin the air approaching the fan or blower.

With most blower applications, engineers stabilize these multi-blade circular to provide reliable and robust performance and guaranteed cost reductions.


Organizations that require comprehensive control and management of their ventilation, such as automobiles, exhaust gasses, and recirculating oven facilities, use inlet vane damping.


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